Because your employment is covered by a collective agreement, your only avenue to hold your employer to account is almost certain to be through your union. You should ask for the assistance of your union representative in addressing your concerns. The union should consider your circumstances and take appropriate action – if necessary commencing a grievance on your behalf. If your union does not take sufficient steps on your behalf, you may have a claim against your union for failure to properly represent you.  Our office does not handle such claims, however.